(function(doc, win){
	var docEl = doc.documentElement,
		resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
		recalc = function(){
			var clientWidth = docEl.clientWidth;
			if (!clientWidth) return;
			if(clientWidth >= 1440){
				docEl.style.fontSize = '100px';
			}else{
				docEl.style.fontSize = 100 * (clientWidth / 1440) + 'px';
			}
		};
		if (!doc.addEventListener) return;
		win.addEventListener(resizeEvt, recalc, false);
		doc.addEventListener('DOMContentLoaded' , recalc, false);
})(document, window);